280 



THE EYE IN EVOLUTION 



Figs. 294 to 296. — Typical Selachian Fishes. 



Fig. 294. — -The dogfish, Scylliorhinus canicula. 



Fig. 295. — The thorziback ra\', Raja clavata (swimming) 



^^^ .^- T , .-.-1 ^ ».Af-^-v. m 





^^ iF^ * .* ■•••»* « • • • • •* * . - ^^ 







■;;*; • i 







• • 



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Fig. 2!){). — The sjDotted ray, Rajd montagui (resting on the bottom) (photo- 

 graphs by Douglas P. Wilson). 



